This is much, much less noticeable, especially if you don't run around with diamond camouflage all the time. With the other weapon trainer, people are going to know that you hacked it because you will have a billion headshots in your combat record. Plus, this trainer unlocks all weapon attachments.

I usually use Jorndel's trainer to give me like 1000 kills and like 256 head shots to make it look real, with this treyarch would be suspicious if i had diamond for pistols and 2 kills with b23r am i right?

You mean to prestige the weapon? You can do that yourself. This trainer maxes out the weapon XP, all you have to do is press the Prestige Weapon button in Create-A-Class. Then, if you want more xp, use the trainer again for that weapon and press the Prestige Weapon button again.